Sex, as a biological and reproductive process, was not "discovered" by any single person; it evolved in nature over hundreds of millions of years. The earliest evidence of sexual reproduction and intercourse dates back about 385 million years in the fossil record, where ancient fish species like Microbrachius dicki showed internal fertilization using specialized organs. So, sexual reproduction emerged gradually in evolutionary history long before humans existed. Regarding the discovery or study of human sex in a cultural and scientific sense, no one person "discovered" it, but scholars and scientists have studied and written about it for centuries. Ancient Greek philosophers such as Aristotle and Plato observed and discussed human sexuality. In modern times, Sigmund Freud is often considered a pioneer in the study of human sexuality from a psychological perspective, while Alfred Kinsey was a seminal figure in researching human sexual behavior and sexuality in the 20th century. Thus, sex evolved biologically deep in evolutionary history, and human understanding and study of sex have developed over millennia through contributions from philosophers, physicians, and scientists.
